dunderheaded
/ˈdʌndərˌhɛdɪd/
adjective
- Stupid, slow to understand, or lacking common sense.
- He made a dunderheaded mistake by leaving his keys in the locked car.
- My dunderheaded friend tried to open the door by pushing when it clearly said 'pull.'
- The dunderheaded plan to build a sandcastle at high tide was doomed from the start.
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